Prepration And Application Of The High-performance Cementitious Self-leveling Floor Mortar

Cement-based self-leveling mortar with excellent performance, it can play an important role in the energy-saving, environmental protection and improving the construction quality, etc. At present, cement-based self-leveling mortar exist less in variety, poor performance, lack of rapid hardening high early strength self-leveling floor materials, and expensive in China.Therefore, it has real practical value in developing the high-quality, economical, fast hard cement-based self-leveling mortar. In addition, the study and application scale of the Cement-based self-leveling mortar was small, technological base was weak in Chongqing city. This study can play an importantly practical significance in accelerating development and application of the cement-based self-leveling mortar in the region.In this paper, we get the mortar mix of the early strength, rapid hardening cement-based self-leveling mortar through analysising the effect of composition of materials, temperature and humidity on self-leveling mortar performance; We have been studied the early strength, high strength, surface whitening mechanisms of self-leveling mortar by XRD and SEM test analysis; Finally, we summed up the self-leveling cement-based configuration should pay attention to the problems and construction technology and evaluate its economy by self-leveling mortar trial. The results show that:1) In Cement Pastes, Sulfur content accounting for 10 ~ 15% of total cementitious materials, the slag and fly ash to replace 20% ~ 30% cement and slag-fly ash ratio was about 1.5; In the aggregate system, we choice mountain silica sand and controll aggregate-cement ratio at 1.0; In the additive systems, content ranges of dispersible polymer powders (RE5011L), stabilizer (A1, A2) and defoamer (P808) at 2.0%~2.5%, 0.05% and 0.5%~1.0%, the performance and cost of self-leveling mortar is best.2) According to orthogonal design test, we obtained that: the best content of dispersible polymer powder (RE5011L), stabilizer (A1, A2) and defoamer (P808) is 1.5%, 0.05% and 0.6%; the dosage of is. The performance of Self-leveling mortar prepared in accordance with the mix proportion is much better than the standard JC/T985-2005《on the ground with cement-based self-leveling mortar》requirements and also fully meet the task requirements.3) When the temperature is below 20℃, the humidity is beyond 70%, the mortar mix proportion under standard test conditions does not meet the preparation requirements. We need to adjust the mortar mix. Adjusted as follows: Portland cement from 60% to 75% adjusted to 75% to 80%, sulfur Cement from 10% to 15% adjusted to 5% to 10%, fly ash from 5% to 10% adjusted to 0 ~ 5%, slag from 15% to 20% adjusted to 10 to 15%, others as the same.4) XRD and SEM analysis showed that: it generated ettringite in the hydration and hardening of self-leveling mortar. With age growth the number of ettringite increase, and the structure of self-leveling mortar continuously dense. If there exists lots of foam in the mortar, it would forme white CaCO3 on the surface of self-leveing mortar.5) According to experimental research, we summarized the following aspects: the self-leveling mortar construction technology, technical measures and the question of the preparation of self-leveling mortar. These guide the engineering application of self-leveling mortar. The price self-leveling mortar is only 507 ~ 657 yuan / ton, so the economy is great.